1991105030700 has 54 divisors (see below), whose sum is σ = 6241008104604. Its totient is φ = 530961341280.

The previous prime is 1991105030699. The next prime is 1991105030777. The reversal of 1991105030700 is 70305011991.

1991105030700 is a `hidden beast` number, since 199 + 110 + 50 + 307 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1106168562 + ... + 1106170361.

Almost surely, 2^{1991105030700} is an apocalyptic number.

1991105030700 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1991105030700 is an abundant number, since it is smaller than the sum of its proper divisors (4249903073904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1991105030700 is a wasteful number, since it uses less digits than its factorization.

1991105030700 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2212338943 (or 2212338933 counting only the distinct ones).

The product of its (nonzero) digits is 8505, while the sum is 36.

The spelling of 1991105030700 in words is "one trillion, nine hundred ninety-one billion, one hundred five million, thirty thousand, seven hundred".